Terminal piece for electric circuit-breakers.



PATEN'IED AUG. 18, 1908.

C. AALBOEG. TERMINAL PIECE FOR ELECTRIC CIRCUIT BREAKERS.

APPLICATION FILED MAY 2, 1906.

WITNESSES:

I TTORNEY UNITED S ATES PATENT oFFIcn.

oHRiS'iIAN AALBoRe, OF WILKI'NSBURG, PENNSYLVANIA, ASSIGNOR 'ro wEsTINeIIoiIsE ELECTRIC & MANUFACTURING ooMP NY, A CORPORATION or PENNSYLVANIA.

I TEIemnAI'. nfer; non nrndrnaic amour-Bananas;

Patented Aug; Is, 1908.

Application filed May 2, 1906. Serial No. 314,857.

To all whom it may concem I Be it known that I, CHRISTIAN AALBORq a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State'of Pennsylvania, have invented a new. and useful Im rovementin Terminal Pieces for Electrical ircuit-Breakers, of which the following isa specification.

I drawing is a longitudinal sectional viewthrough apair of circuit-breaker terminal v pieces that embody myinvention.

My invention relates to'. electrical circuit-' heretofore been practicable.

The single figure of the accompanying particularly to terminal pieces Secured, by means of tap "screws l to the reduced lower end ofa cylindricalblock 2 that is recessed. and threaded in its-up er end. to receive the terminal of anelectrical circuitconductor (not shown), is a tube3 the lower end of which has a frusto-con'ical inner surface. The tube 3 comprises an innermetallic bushing 4, a plurality ofl-ayers 5 of thin sheet metal, such ascopper, and two. outer Sleeves 6 and 7, the outermost sleeve 7 being shorter than the sleevefi. The layers of thin sheet metal 5 may be formed by-roll- ,ing a strip of materiallabout the'bu'shing 4 '35 'jf-Iess conveniently, by'placing a plurality of until the desired thickness is obtained, or,

" cylinders of progressively increasingdiame- 7 means ters, oneou'tside another. The lower, open end ofthe tube 3 is then beveled interiorly so that the-free ends of the laminae form an in-'. 'f 'Wa'rdly and upwardly ta ered surfaceand is divided to a plurality o flexible sections by 0 radial cuts or s lits, 8 that-extend I from its outer end toward and nearly to the -smaller', end ofthe cylindrical block 2'. 1 Located within'and projecting somewhat below theopen'end of thetube 3 is a rod9, that is screw threa'ded intothe'smaller end of I the cylindrical block 2, and is provided'with a knob. 10 at its-lower endand with a reduced intermediateportion 11: Surrounding the body portion of the rod 9 is a sleeve 12,'the

lower end of which is split longitudinally and sha edandienlarged as shown.

e terminal piece just described is adaptgaged ninal piece.

closed, by another' tubular terminal piece 14 having a frusto conical external surface,

led to be'engage'd,"when the circuit-breaker is p the taper of which corresponds to that of the inner surface-of the lower end of the tube 3 with which it is adapted to engage. The rod 9 and the sleeve 12 project 1Iito the cylin- A dricalopening 15 in 'the terminal piece 14, the enlarged end of the sleeveengaging the innei'surface. When the terminal pieces are separated after having been in engagement, the enlarged end. of the-sleeve 12 and the knob 10 on the rod 9 are the last portions of the up r terminal piece to become disenfr om the lower terminal piece, and arcs that form between the terminal pieces will occur between the knob and the fiare'd upper end of the cylindrical openingin the terminal piece 14. Thus all danger of injury to the contact surfaces of the terminal ed. When the'upper terminal piece is conpieces that might be caused by arcs is avoidstructedas shown and described'a greater area of engagement between terminal pieces is provided, than has heretofore been the case, since eachl'amina of the tube 3 en ages the outer surface of the frusto-conica ter- If desired, the tube 3 may be formed by a plurality of separate sectionscomposed of a plurality ofthln strips of metal and secured in a suitable manner to the small end of the cylindrical block 2,; and the detailsof con structionfand arrangement may be further Inodified within suitable limits-without departing from the spirit of the invention.

I claim as" my'inventioriz 1. A tub lar terminal piece comprising a lurality of cylindrical, radially slotted aminae and having an inwardly tapered open'end.

2. A tubular terminal'cpiece having aninwardly tapered open en and comprising a plurality of cylin ers of sheet meta havlng radial cuts extending longitudinally inward from said open end. v

-3. A- tubular terminal 'iece having an inwardly tapered open en and comprising a rolled strip of sheet metal havin extending longitudinally inward open end. A v A 4. The combination with a tubular terminal piece having an inwardly tapered 0 en end and comprising a plurality of cylin ers of sheet metal having radial cuts extending radial cuts from said.

longitudinally inward from said 0 en end, of a rod that is secured to the ot er end of the terminal piece and projects therefrom through the 0 en end.

5. The com ination with a tubular terminal piece having an inwardly tapered 0 en end and comprising a plurality of cylin ers of sheet metal havin radial cuts extending longitudinally inward from said open end, of a rod that is surrounded by and projects from the tapered end of the tube and the outer end of which is provided with a knob or head, and a flexible tubular sleeve that surrounds the rod behind the knob or head.

6. The combination with a tubular terminal piece having an inwardly tapered 0 on end and comprising a plurality of cylinc ers of sheet metal having radial cuts extending longitudinally inward from said open end, of a rod that is surrounded by and projects through the tapered end of the tube and the outer end of which is provided with a head or knob.

7. The combination with a tubular terminal piece having an inwardly tapered open end and com rising a plurality of cylinders of sheet meta havmg radial cuts extending longitudinally inward from said open end, of a rod that is surrounded by and projects from the ta ered end of the tube and has a head or knob at its outer end and a reduced intermediate portion, and a flexible tubular sleeve which surrounds the reduced portion of the rod.

8. A tubular terminal piece comprising a plurality of circumferentially laminated sec tions the ends of which are beveled to form an inwardly tapered open end. I

9. The combination with a tubular terminal piece that is laminated circumferentially and cut radially and has an inwardly tapered open end, of a frustoconical terminal piece to enga e the tapered inner surface of said terminal piece.

10. The combination with a tubular terminal piece having an inwardly tapered open end and com rising a plurality of cylinders of sheet meta havin radial cutsv extending longitudinally inward from said open end, of a rod that is surrounded by and projects from the tapered end of the tube and has a head or knob at its outer end, and another tubular terminal piece having a frustoconical. outer surface to engage the tapered inner surface of the laminated terminal piece and a cylindrical inner surface to engage the rod.

11. The combination with a tubular terminal piece having an inwardly tapered 0 en end and com rising a plurality of cylin ers of sheet meta having radial cuts extending longitudinally inward from said open end, of a rod rovided with a split sleeve and having a hearv or knob at its outer end, and another tubular terminal piece having a frustoconical outer surface to engage the tapered inner surface of the laminated terminal piece and a cylindrical inner surface to engage the rod and its split sleeve.

12. A circumferentially laminated and longitudinally split tubular contact piece the contact end of which has a frusto-conical inner surface.

13. A contact terminal comprising a plurality of cylindrical, longitudinally slotted laminae having beveled ends forming a frusto-conical contact surface, and a centrally located rod having a resilient split sleeve. v

14. A contact terminal comprisin a cylindrically laminated and longitudinally slotted member having a frusto-conical inner surface and a central rod having a knob or head and a resilient split sleeve.

in testimony whereof, I have hereunto subscribed my name this 30th day of April,

CHRISTIAN AALBORG.

Witnesses:

A. G CoRRAo, BIRNEY HINEs. 

